Correlation of the microdislocation parameters with the hardness of plastically deformed heat-resistant steels
| Autor: | D. Ya. Baran, P. O. Marushchak, P. V. Yasnii, V. B. Hlad’o |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Materials Science. 44:194-200 |
| ISSN: | 1573-885X 1068-820X |
| DOI: | 10.1007/s11003-008-9077-z |
| Popis: | By the methods of electron-transmission microscopy and nondestructive testing, we study basic regularities of the influence of high-temperature plastic deformation on the kinetics of hardening of 15Kh13MF and 25Kh1M1F heat-resistant steels. The difference between the intensities of exhaustion of the plasticity of steels is discovered. Thus, the process of hardening of 15Kh13MF ferritic-martensitic steel is more intense, which is explained by the increase in nonparallelism and the decrease in the distance between subboundaries of the dislocation microstructure, reduction of sizes, and fragmentation of dislocation martensite. The 25Kh1M1F ferritic-pearlitic steel is characterized by less intense hardening explained by a different type of evolution of the dislocation structure connected with the transformation of dislocation nets and cells into globular and cellular disoriented structures and then into fragmented structures. It is shown that the relationship between the characteristics of substructural hardening, the density of dislocations within the low-angle boundaries, and the hardness (microhardness) of the material in the process of plastic deformation of heat-resistant steels can be described by a linear dependence independently of the level of strains. |
| Databáze: | OpenAIRE |
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